Abstract

Wireless communication usually requires increased bandwidth, coverage and data transfer rates , to reduce interference and reduce costs . Currently, a large number of wireless LAN - based AP , because of the mobility of the user while the performance decreased, the total data throughput is often less than the ideal value . 802.11 wireless LAN design includes two main parts : the AP in the service area of the place, the frequency allocation of each AP . When the AP is placed in the service area , the coverage and capacity is a key factor , typically AP needed to cover all users . In this paper, a mobile user channel allocation , a wireless LAN AP channel assignment algorithm to maximize the user side of the signal-to-interference ratio (SIR). The AP's channel assignment is based on the amount of interference between the Minimize AP . When the user enters the room , we load balancing scheme to reduce the power of the most congested AP until load balancing . Based on the initial allocation , we calculate the signal-to-interference ratio for each user using MATLAB software to study the different location of the user channel allocation . Finally, with OPNET software , by assigning the AP on different channels and the mobile users and fixed users and network situations , to study the impact of the mobile users on the channel allocation . The results show that the algorithm to improve the performance of the client 's network . The algorithm can be used for any wireless LAN , regardless of the user profile and user load situations .